I have confirmed that all five bluebird eggs have transmogrified into five almost-fledged bluebird babies. After years of minimal success in the bluebird box, this is a joy to behold. Of course, a big test is yet to come: fledging.
Last night when I opened the box, one fledgling let out a squawk as it repositioned deeper in the box. Hearing his progeny sound this warning greatly displeased Mr. Bluebird, who loudly scolded me from a nearby tree. I shut the box and beat a hasty retreat.
Based on the tail feather growth I see here, I suspect fledging at any moment. I will be watching, hoping to catch the great leaps!